JP7209323B2 - Flood monitoring system, flood gate monitoring method and program - Google Patents

Description

The present disclosure relates to a floodgate monitoring system, a floodgate monitoring method, and a program for monitoring the water level in the vicinity of the floodgate.

Patent Document 1 discloses that in a water gate monitoring support system, when at least one identification number among the identification numbers for identifying each water gate assigned to each water gate is specified, the water gate is installed at the water gate with the specified identification number. A technique is disclosed for preferentially displaying an image captured by a photographing unit on a screen. The sluice gate monitoring device that constitutes this sluice gate monitoring support system predicts fluctuations in the water level in the vicinity of each sluice gate, and assigns an identification number to the sluice gate that has determined that the predicted water level value exceeds the threshold value. Display the identification number information shown.

JP 2013-211669 A

In Patent Literature 1, an image captured by an imaging unit installed at a water gate is only preferentially displayed on a display device when it is determined that a predicted water level value exceeds a threshold value (for example, a warning value). and is not considered to be used, for example, for predicting or monitoring steady water levels. In addition, no consideration has been given to judging whether the water gate is open or closed using the image captured by the camera unit.

The present disclosure has been devised in view of the conventional situation described above, and uses an image captured by a camera set so as to include the river in the vicinity of the water gate in the angle of view, and measures the water level of the river and the need for opening and closing the water gate. It is an object of the present invention to provide a water gate monitoring system, a water gate monitoring method, and a program that adaptively determine whether or not the water gate is not in use and support efficient water gate monitoring.

The present disclosure is a water gate monitoring system in which a camera for imaging the vicinity of a water gate having a gate and a water gate monitoring device are communicably connected, wherein the camera includes a water gauge indicating the water level in the vicinity of the water gate and the water gate. as a subject and repeatedly transmitted to the water gate monitoring device, and the water gate monitoring device is communicably connected to a water gate opening and closing device for controlling opening and closing of the water gate, and based on the captured image , the Determining the water level, transmitting an opening/closing control signal for the water gate corresponding to the determined water level to the water gate opening/closing device, and capturing the image of at least one information code arranged on the gate included in the captured image . A floodgate monitoring system is provided that determines whether the floodgate is open or closed based on its position in the image .

Further, the present disclosure is a water gate monitoring method in a water gate monitoring system in which a camera for imaging the vicinity of a water gate having a gate and a water gate monitoring device are communicably connected, wherein the camera measures the water level in the vicinity of the water gate. A captured image including a water gauge and a water gate as subjects is captured and repeatedly transmitted to the water gate monitoring device, and the water gate monitoring device is communicably connected to a water gate opening/closing device that controls opening and closing of the water gate, and the image is captured. Based on the image , the water level is determined, and an opening/closing control signal for the water gate corresponding to the determined water level is transmitted to the water gate opening/closing device, and at least one of the gates included in the captured image is arranged. A water gate monitoring method for judging whether the water gate is open or closed based on the position of the captured information code in the captured image .

In addition, the present disclosure provides a water gate monitoring device, which is a computer, connected communicatively with a camera that captures images of the vicinity of a water gate having a gate, and the water level in the vicinity of the water gate, which is repeatedly transmitted from the camera. A water gate opening/closing device for determining the water level based on a captured image including a water gauge and a water gate as subjects, and for controlling the opening/closing of the water gate by sending an opening/closing control signal for the water gate corresponding to the determined water level. and determining the opening/closing status of the water gate based on the position in the captured image of at least one information code arranged on the gate included in the captured image. , offering a program.

According to the present disclosure, it is possible to adaptively determine the state of the water level of the river and the necessity of opening and closing the water gate by using the image captured by the camera set so that the river near the water gate is included in the angle of view. can assist in performing effective lock monitoring.

FIG. 2 shows an example of a situation in the vicinity of the water gate where the water gate monitoring system according to Embodiment 1 is installed; Diagram showing a configuration example of a water gate monitoring system Diagram showing a hardware configuration example of a surveillance camera A diagram showing an example of the hardware configuration of a PC A diagram showing an example of the arrangement of two-dimensional water level code notation plates attached along the scale of the water level gauge attached to the gate post of the flood gate. A diagram showing an example of the mounting state of the fixture that supports the two-dimensional height code notation plate. Flowchart showing procedures for opening and closing the water gate when the water level rises according to the first embodiment A diagram showing an example of a captured image obtained by capturing a plurality of two-dimensional codes for water level and two-dimensional codes for height included in the image capturing area when the water level rises. FIG. 10 is a diagram showing an example of a captured image obtained by capturing a plurality of two-dimensional codes for water level and two-dimensional codes for height contained in the image capturing area after performing control to raise the gate; Flowchart showing procedures for opening and closing the water gate when the water level drops according to the first embodiment A diagram showing an example of a captured image obtained by capturing a plurality of two-dimensional codes for water level and two-dimensional codes for height included in the imaging area when the water level is lowered. FIG. 10 is a diagram showing an example of a captured image obtained by capturing a plurality of two-dimensional codes for water level and two-dimensional codes for height contained in the image capturing area after performing control to lower the gate; A diagram showing an example of a water gate status monitoring screen FIG. 11 is a diagram showing an example of a captured image of a state in which the gate is open within the angle of view of the surveillance camera according to the second embodiment; A diagram showing an example of a captured image of a state in which the gate is closed within the angle of view of the surveillance camera. Flowchart showing opening/closing operation of water gate and opening/closing determination procedure when water level rises according to Embodiment 2 A diagram showing an example of a water gate status monitoring screen when open/close judgment is performed

Hereinafter, embodiments specifically disclosing a floodgate monitoring system, a floodgate monitoring method, and a program according to the present disclosure will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid unnecessary verbosity in the following description and to facilitate understanding by those skilled in the art. It should be noted that the accompanying drawings and the following description are provided for a thorough understanding of the present disclosure by those skilled in the art and are not intended to limit the claimed subject matter.

(Embodiment 1)
In rivers, sluice gates are installed at confluence points such as tributaries and drainage channels. Water gates are opened and closed to regulate the inflow and outflow of water in order to keep the water level of the river at a constant height. In addition, the water gate also functions as a levee to prevent flooding of water. In the following embodiments, an example of a water gate monitoring system that monitors such a water gate using a monitoring camera will be described.

FIG. 1 is a diagram showing an example of a situation in the vicinity of a water gate in which a water gate monitoring system 5 according to Embodiment 1 is installed.

The water gate 100 is, for example, a gate-shaped structure installed on an embankment 400 built along the river bank. The water gate 100 includes a pair of gateposts 110 interposed in the middle of the embankment 400, a building 120 supported on the upper part of the pair of gateposts 110, and a gate 150 as an example of a gate that can be vertically moved between the pair of gateposts 110. and including.

A water gate opening/closing device 70 for driving a suspended gate 150 is attached to the lower surface of the building 120 . Inside the building 120, a monitoring room 200 is arranged in which a guard who monitors the water gate 100 resides. A part of equipment of the water gate monitoring system 5 is arranged in the monitoring room 200 .

As an example of the water gate, the height of the water gate 100 (that is, the height from the bottom surface to the top end of the gate post 110) is 20 m. The length in the height direction of the gate 150 that vertically moves between the pair of gateposts 110 is 10 m. When the water gate 100 is in the fully closed state, the height of the gate 150 is set to 4 m, for example. On the other hand, when the water gate 100 is fully open, the height of the gate 150 is set to 14 m, for example. In other words, when the gate 150 is fully opened, the water gate 100 forms a channel having an opening with a height of 10 m. It goes without saying that these numerical values are exemplified for easy understanding of the description and are not limited.

FIG. 2 is a diagram showing a configuration example of the water gate monitoring system 5. As shown in FIG. The floodgate monitoring system 5 includes a surveillance camera 10 , a PC (Personal Computer) 30 , a recorder 40 , a hub 50 , a monitor 60 and a floodgate opening/closing device 70 .

The water gate opening/closing device 70 has an elevator for moving the suspended gate 150 up and down, and a motor (not shown) for driving the elevator. Move to desired height.

The hub 50 converges the communication cable of the surveillance camera 10, the communication cable of the water gate operator 70, and the communication cable of the PC 30, and connects them so as to enable data communication. The recorder 40 records an image captured by the surveillance camera 10 according to instructions from the PC 30 , reproduces the recorded image, and outputs the recorded image to the PC 30 and the monitor 60 . A monitor 60 displays the reproduced video output from the recorder 40 . In addition, the monitor 60 can display captured images output from the PC 30 in real time.

The monitoring camera 10 is a weather-resistant outdoor camera that can take good pictures even in severe environments such as rain, wind, and changes in temperature. The monitoring camera 10 is a camera that has pan/tilt/zoom functions and can arbitrarily change the imaging area. The surveillance camera 10 takes an image so that the upper part of the gate 150 and the side of the gatepost 110 on one side are within the angle of view, for example. The monitoring camera 10 transmits captured video data to the PC 30 via the communication cable and hub 50 . In addition to capturing images of the river, the monitoring camera 10 captures images of the two-dimensional code notation plates attached to the gate 150 and the gatepost 110 in order to keep the water level of the river at an appropriate height, and reads and decodes the two-dimensional code. (so-called decoding).

Depending on the shape of the water gate and the posture of the surveillance camera 10, the surveillance camera 10 may not be able to capture the image of the two-dimensional code notation plate from the front, and even if the image is captured, only an image of the two-dimensional code distorted into a trapezoid may be obtained. . In such a case, the monitoring camera 10 may perform projective transformation to generate and acquire a transformed image of a square two-dimensional code so that the two-dimensional code can be easily decoded.

FIG. 3 is a diagram showing a hardware configuration example of the monitoring camera 10. As shown in FIG. A monitoring camera 10 as an example of a camera includes a CPU 11, a storage unit 12, an imaging unit 13, an image processing unit 14, a communication unit 15, a pan/tilt driving unit 16, an acceleration sensor 18, and an IR irradiation unit 19. , is a configuration including.

The pan-tilt driving section 16 drives the imaging section 13 in the pan direction and the tilt direction, and includes a tilt control section 21 , a pan control section 22 , a tilt motor 23 and a pan motor 24 . The tilt control section 21 controls the rotation angle of the tilt motor 23 . The pan control section 22 controls the rotation angle of the pan motor 24 .

The acceleration sensor 18 outputs a signal corresponding to the posture (pan angle, tilt angle) of the surveillance camera 10 . The CPU 11 controls the attitude of the surveillance camera 10 based on the signal output from the acceleration sensor 18 . As the acceleration sensor 18, for example, a semiconductor type using a semiconductor piezoresistive effect or a mechanical type in which a movable contact and a fixed contact are opened and closed by a rotating mass body are used.

The imaging unit 13 has a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) as an imaging device. The imaging unit 13 includes a notation plate (see FIG. 5) for the height two-dimensional code 85 attached to the top of the gate 150, and a plurality of water level two-dimensional codes 81 pasted along the scale of the water level gauge 93. An imaging area (subject) including a notation plate is imaged, and imaged video data is acquired. Hereinafter, the notation plate of the two-dimensional code 85 for height is abbreviated as the two-dimensional code 85 for height. Also, the notation plate of the two-dimensional code 81 for water level is abbreviated as two-dimensional code 81 for water level.

The image processing unit 14 performs various kinds of signal processing such as AD conversion, color correction, noise removal, edge enhancement, etc. on the data signal of the captured image captured by the image capturing unit 13 .

The storage unit 12 stores the parameters (pan angle, tilt angle, zoom magnification) of the monitoring camera 10 as preset values so that the angle of view of the monitoring camera 10 includes a predetermined imaging area. The storage unit 12 includes, for example, RAM (Random Access Memory) and ROM (Read Only Memory), and stores programs and data necessary for executing the operation of the surveillance camera 10, as well as information or data generated during operation. Save temporarily. The RAM is a work memory used when the CPU 11 operates, for example. The ROM stores in advance programs and data for controlling the CPU 11, for example.

The CPU 11 controls operations of each unit of the surveillance camera 10 . The CPU 11 functions as a control unit of the surveillance camera 10, and performs control processing for overall control of the operation of each unit of the surveillance camera 10, data input/output processing with each unit of the surveillance camera 10, and data calculation ( computation) processing and data storage. The CPU 11 operates according to programs and data stored in the ROM within the storage unit 12 . The CPU 11 reads the preset value stored in the storage unit 12 and controls the attitude of the surveillance camera 10 to a position corresponding to the preset value based on the signal output from the acceleration sensor 18 . The CPU 11 transmits data of a captured video imaged by the imaging unit 13 and subjected to signal processing by the video processing unit 14 to the PC 30 via the communication unit 15 .

The communication unit 15 is connected to the hub 50 via a communication cable, and is communicably connected to the PC 30 via a wired LAN (Local Area Network). Note that the communication unit may be communicably connected to the PC via a wireless LAN.

The IR irradiation unit 19 irradiates near-infrared light (IR (infrared radiation) light) to an imaging area including the height two-dimensional code 85 and a plurality of water level two-dimensional codes 81 . Thereby, the imaging unit 13 can image the two-dimensional code 85 for height and the plurality of two-dimensional codes 81 for water level even at night. Here, the case where light reaches a long distance at night and IR light, which is invisible light, is applied is shown. Light may be applied.

FIG. 4 is a diagram showing a hardware configuration example of the PC 30. As shown in FIG. A PC 30 as an example of a floodgate monitoring device includes a processor 31 , a memory 32 , a display section 33 , an operation section 34 , a recording section 35 , an input/output I/F 36 , a communication I/F 37 and a speaker 38 .

The processor 31 is configured using, for example, a CPU (Central Processing Unit), a DSP (Digital Signal Processor), or an FPGA (Field Programmable Gate Array), and controls the operation of each section of the PC 30 . The processor 31 functions as a control unit of the PC 30, and performs control processing for overall control of the operation of each unit of the PC 30, data input/output processing with each unit of the PC 30, data calculation (calculation) processing, and data processing. amnestics. Processor 31 operates according to programs and data stored in memory 32 .

The memory 32 is configured using, for example, a RAM and a ROM, and temporarily stores programs and data necessary for executing the operation of the PC 30, as well as information and data generated during operation. The RAM is a work memory used when the processor 31 operates, for example. The ROM pre-stores programs and data for controlling the processor 31, for example.

The display unit 33 is configured using, for example, an LCD (Liquid Crystal Display) or an organic EL (Electroluminescence), and displays captured images captured by the monitoring camera 10, various measurement data, or the like.

The operation unit 34 is configured by, for example, a keyboard or a mouse, or a combination thereof, and receives input operations by the observer.

The recording unit 35 temporarily records images captured by the monitoring camera 10, and also records data such as the water level and open/close determination results.

A recorder 40 is connected to the input/output I/F 36 . Note that the recorder 40 that records and reproduces video may be built in the PC 30 . In this case, the PC 30 is equipped with a large-capacity storage and video recording/playback software as the recorder 40 .

The communication I/F 37 is connected to the hub 50 and performs data communication with the monitoring camera 10 and the floodgate opening/closing device 70 connected to the hub 50 .

The speaker 38 emits a sound or the like prompting the guard to open or close the gate 150 .

FIG. 5 is a diagram showing an arrangement example of a plurality of water level two-dimensional codes 81 notation plates attached along the scale of the water gauge 93 attached to the gate post 110 of the water gate 100 . The water level meter 93 has a scale marking the water level of the river at intervals of 1 m in the height direction. Adjacent to the water level gauge 93, a plurality of water level two-dimensional codes 81 are pasted at intervals of 1 m along the scale engraved on the water level gauge 93. As shown in FIG. On the gatepost 110, ten water level two-dimensional codes 81 are pasted at intervals of 1 m, for example, within a range of water levels from 0 m to 10 m.

The water level two-dimensional code 81 includes information such as height in meters, date of construction, water gate identification number, and position information (eg, latitude, longitude, altitude, etc.). It is preferable to use a weather-resistant material for the notation plate of the water level two-dimensional code 81 so as to withstand wind and rain. For example, the notation plate of the water level two-dimensional code 81 may be, for example, paper, a plastic plate, a metal plate, or the like having waterproof and corrosive properties. Also, the water level two-dimensional code 81 may be printed directly on the side surface of the gatepost 110 . The notation plate of the water level two-dimensional code 81 is a substantially square plate material having a size of about 10 cm to 20 cm. The two-dimensional code notation plate having the above specifications is the same as the notation plate for the two-dimensional code for height and the notation plate for the two-dimensional code for opening and closing, which will be described later.

The index of height that can be read and decoded by the monitoring camera 10 may be a one-dimensional bar code instead of a two-dimensional code. Moreover, in the case of a two-dimensional code, various codes such as a data matrix code and a color code may be used in addition to the QR code (registered trademark). Also, non-coded characters (for example, “height ◯ m”) may be used as the height indicator. In this case, the monitoring camera 10 is equipped with an OCR (Optical Character Recognition) function, and is capable of reading and deciphering character information such as height included in the captured image. The surveillance camera 10 transmits the read character information to the PC 30 .

On the other hand, on the upper part of the gate 150, two height two-dimensional codes 85 are fixed by fixtures 300 (see FIG. 6) to measure the height of the gate. The two height two-dimensional codes 85 each include two-dimensional code identification information, construction date, water gate identification number, and position information (eg, latitude, longitude, altitude, etc.). The surveillance camera 10 is fixed in a posture such that the two height two-dimensional codes 85 attached to the gate 150 and the multiple water level two-dimensional codes 81 attached to the gatepost 110 are within the angle of view SA. be done. The monitoring camera 10 captures images at intervals of 1 m from the lowest (fully closed) height to the highest (fully open) height of the gate 150, and two height images captured at each height position are captured. An image including the two-dimensional code 85 for the user is stored in the storage unit 12 . Although one height code 85 may be used, two height codes are used for backup purposes. Moreover, it is preferable that the two height two-dimensional codes 85 do not store the same content, but store different content (for example, an identification number and position information).

The PC 30 compares the size of the two-dimensional code 85 for height included in the image captured by the monitoring camera 10 with the size of each of the two-dimensional codes 85 for height stored in advance in the storage unit 12 at intervals of 1 m. As a result of this comparison, the PC 30 determines the position of the stored two-dimensional code 85 having the size closest to the size of the two-dimensional code 85 for height included in each captured image that constitutes the captured video. Obtained as the height of the gate 150 .

Note that the surveillance camera 10 does not use the size of the two-dimensional code 85 for height stored in advance in the storage unit 12, but the position ( That is, the height of the height two-dimensional code 85 may be geometrically calculated based on the (x, y) coordinates), the size, and the posture (tilt angle with respect to the vertical direction) of the surveillance camera 10 . In addition, the surveillance camera 10 or the PC 30 captures the position (that is, (x, y) coordinates) of the two-dimensional code 85 for height shown in the captured image and the height of the two-dimensional code 85 for height corresponding to that position. The height of the two-dimensional code 85 for height appearing in the captured image may be calculated using a table (not shown) associated therewith.

FIG. 6 is a diagram showing an example of a mounting state of a mounting fixture 300 that supports the notation plate of the height two-dimensional code 85. As shown in FIG. The fixture 300 is attached to the upper end of the ladder 250 fixed to the front side of the gate 150 . The fixture 300 has a fixed member 310 having a substantially U-shaped shape and a movable member 320 attached to the side surface of the fixed member 310 . The fixing member 310 is fixed by screwing its back member to the support of the ladder 250 . The movable member 320 includes a frame 320a to which the two-dimensional code 85 for height is fixed, and fan-shaped plates 320b formed on both sides of the frame 320a and capable of rotating the frame 320a with respect to the side surface of the fixed member 310. so that it is molded. The movable member 320 is adjusted to a predetermined angle so that the height two-dimensional code 85 attached to the frame 320a faces the front with respect to the imaging direction (optical axis direction) of the surveillance camera 10. FIG. For example, the movable member 320 can be adjusted from 0° to 45° with respect to the vertical direction. Moreover, the size of the two-dimensional code 85 for height is, for example, 300 mm×300 mm.

Next, the operation of the water gate monitoring system 5 according to Embodiment 1 described above will be described.

Here, the case where the height of the gate 150 is adjusted according to the water level of the river to increase or decrease the amount of water flowing through the opening of the water gate 100 is shown. First, the case where the water level of the river rises is shown.

FIG. 7 is a flow chart showing the procedure for opening and closing the water gate 100 when the water level rises according to the first embodiment. The surveillance camera 10 adjusts the pan angle, tilt angle, and zoom magnification to preset values so that the angle of view SA indicating the imaging area (imaging range) is an angle of view that allows imaging. The monitoring camera 10 constantly captures an image of an angle of view SA indicating an imaging area (imaging range), and repeatedly transmits the captured image to the PC 30 via the communication unit 15 and the hub 50 .

Processor 31 of PC 30 acquires captured video transmitted from surveillance camera 10 via hub 50 and communication I/F 37 . The processor 31 temporarily stores the acquired video in the recording unit 35 and also records it in the recorder 40 via the input/output I/F 36 .

The processor 31 selects, for example, the lowest water level two-dimensional code 81 that is not submerged (that is, can be recognized) among the plurality of water level two-dimensional codes 81 that are included in the captured image of the surveillance camera 10. 81 and read the height information. Processor 31 determines that this height is the current water level. Although the processor 31 decodes only the lowest water level two-dimensional code 81, the processor 31 decodes all the water level two-dimensional codes 81 displayed in the video, and among all the decoded height information, the lowest height may be determined as the water level. The processor 31 determines whether or not the height information read by the lowest water level two-dimensional code 81 has reached a water level rise level that is judged to be a rise in water level (S1). The water level rise is, for example, 6m.

Here, the surveillance camera 10 decodes the water level two-dimensional code 81 to read the height information and transmits it to the PC 30 , but the surveillance camera 10 may only transmit the captured image to the PC 30 . The processor 31 may decode the water level two-dimensional code 81 included in the captured image received from the monitoring camera 10 to read the height information. In this case, the surveillance camera can omit the decoding process, and the device cost can be reduced.

FIG. 8 is a diagram showing an example of a photographed image obtained by photographing a plurality of two-dimensional codes 81 for water level and two-dimensional codes 85 for height included in the angle of view SA indicating the imaging area (imaging range) when the water level rises. be. When the water level has reached the water level rise level, for example, when the water level has risen to 6 m, the water level two-dimensional code 81 attached to the position of the scale of 6 m in the water level gauge 93 is submerged, and the monitoring camera 10 is damaged. This water level two-dimensional code 81 does not appear in the captured image. Therefore, the processor 31 determines that the water level has risen to 6m. The processor 31 includes the fact that the water level is 6 m in the water gate condition monitoring screen GM1 (see FIG. 13) displayed on the display unit 33 . The water gate status monitoring screen GM1 is always displayed on the display unit 33 by the processor 31 when the water gate monitoring system 5 is monitoring the water gate 100 .

The processor 31 performs control to open the water gate 100 according to the increase in water level (S2). Via communication I/F 37 and hub 50 , processor 31 transmits an opening/closing control signal to watergate opening/closing device 70 to instruct gate 150 to be raised. For example, if the water level is 6m, the height of the gate 150 is instructed to be 7m. When an instruction is issued so that the height of the gate 150 is 7 m, the height from the lower end of the gate 150 to the bottom is increased to 3 m, and the opening of the waterway is widened. Note that the height of the gate 150 corresponding to the water level varies depending on the installation location of the water gate, etc., so it is determined to be an appropriate value depending on the operation. Upon receiving an instruction from the PC 30 via the hub 50, the water gate opening/closing device 70 raises the gate 150 so that the height of the gate 150 is 7 m.

Here, the processor 31 transmits an opening/closing control signal including an instruction to raise the gate door 150 to the water gate opening/closing device 70 so as to widen the opening of the water gate 100. You can direct. In this case, the processor 31 adds an instruction message such as "Open 1 m" to the water gate condition monitoring screen GM1 (see FIG. 13) displayed on the display unit 33, for example. The watchman operates the gate opening/closing device 70 to raise the gate 150 according to this instruction message.

In this case as well, the processor 31 acquires the image captured by the surveillance camera 10 and reads the height information of the lowest water level two-dimensional code 81 that is not submerged among the plurality of water level two-dimensional codes 81 . The processor 31 determines whether or not the height of the gate 150 has reached the target height (for example, 7 m) (S3). If the target height is reached, the processor 31 terminates this process. On the other hand, if the target height is not reached, the processor 31 repeats the process of step S2.

FIG. 9 shows an image of a plurality of water level two-dimensional codes 81 and height two-dimensional codes 85 included in an angle of view SA indicating an imaging area (imaging range) after performing control to raise the gate 150. It is a figure which shows the image example. In the image captured by the surveillance camera 10, the water level two-dimensional code 81 pasted on the 5m scale of the water level gauge 93 is not shown because it is submerged, and the water level two-dimensional code 81 pasted on the scale of 6m is shown. ing. Therefore, the processor 31 determines that the water level has dropped to 5m.

Next, the case where the water level of the river drops will be shown. FIG. 10 is a flow chart showing the procedure for opening and closing the water gate 100 when the water level drops according to the first embodiment. Processor 31 of PC 30 acquires captured video transmitted from surveillance camera 10 via hub 50 and communication I/F 37 . The processor 31 temporarily stores the captured image in the recording unit 35 and records it in the recorder 40 via the input/output I/F 36 .

The processor 31 selects, for example, the lowest water level two-dimensional code 81 that is not submerged (that is, can be recognized) among the plurality of water level two-dimensional codes 81 that are included in the captured image of the surveillance camera 10. 81 and read the height information. Processor 31 determines that this height is the current water level. Although the processor 31 decodes only the lowest water level two-dimensional code 81, the processor 31 decodes all the water level two-dimensional codes 81 shown in the image, and among all the decoded heights, the lowest height may be determined as the water level. The processor 31 determines whether or not the height information read by the lowest water level two-dimensional code 81 has reached a water level drop level that is judged to be a drop in the water level (S11). The water level lowering level is, for example, 4m.

Note that the monitor camera 10 may transmit only the captured image to the PC 30, and the PC 30 may decode the water level two-dimensional code 81 to read the height information, as in the case of the rise of the water level.

FIG. 11 is a diagram showing an example of a captured image obtained by capturing a plurality of two-dimensional codes 81 for water level and two-dimensional codes 85 for height included in the angle of view SA indicating the imaging area (imaging range) when the water level is lowered. be.

When the water level reaches the water level drop level, for example, when the water level drops to 4 m, the water level two-dimensional code 81 pasted on the 4 m scale of the water level gauge 93 is submerged. The two-dimensional code 81 for use does not appear in the image captured by the surveillance camera 10 . However, the water level two-dimensional code 81 attached to the 5 m position of the scale of the water level gauge 93 is above the water, so it is reflected in the image captured by the monitoring camera 10 . Therefore, the processor 31 determines that the water level has dropped to 4m. The processor 31 includes the fact that the water level is 4 m in the water gate condition monitoring screen GM1 (see FIG. 13) displayed on the display unit 33 .

The processor 31 performs control to close the water gate 100 when the water level drops (S12). Via communication I/F 37 and hub 50 , processor 31 transmits an opening/closing control signal to water gate opening/closing device 70 to instruct gate 150 to be lowered. For example, when the water level is 4m, the processor 31 issues an instruction to perform closing control so that the height of the gate 150 is 5m. When an instruction is issued to increase the height of the gate 150 to 5 m, the height from the lower end of the gate 150 to the bottom is reduced to 1 m, and the opening of the waterway becomes narrower.

FIG. 12 shows an image of a plurality of water level two-dimensional codes 81 and height two-dimensional codes 85 included in the angle of view SA indicating the imaging area (imaging range) after the gate 150 is controlled to be lowered. It is a figure which shows the image example. In the image captured by the surveillance camera 10, the water level two-dimensional code 81 pasted on the 5m scale of the water level gauge 93 is not shown because it is submerged, and the water level two-dimensional code 81 pasted on the scale of 6m is shown. ing. Therefore, the processor 31 determines that the water level has risen to 5m.

In this case, the processor 31 transmitted the opening/closing control signal including the instruction to lower the gate 150 to the water gate opening/closing device 70 so as to narrow the opening of the water gate 100, but instructed the observer to manually operate it. may In this case, the processor 31 adds an instruction message such as "Close 1m" to the water gate condition monitoring screen GM1 (see FIG. 13) displayed on the display unit 33, for example. The watchman operates the water gate opening/closing device 70 to lower the gate 150 according to this instruction message.

In this case as well, the processor 31 acquires the image captured by the surveillance camera 10 and reads the height information of the lowest water level two-dimensional code 81 that is not submerged among the plurality of water level two-dimensional codes 81 . The processor 31 determines whether or not the height of the gate 150 has reached the target height (eg, 5 m) (S13). If the target height is reached, the processor 31 terminates this process. On the other hand, if the target height is not reached, the processor 31 repeats the process of step S12.

Here, the two-dimensional code for the water level is pasted at intervals of 1 m, and the height of the gate 150 is varied at intervals of 1 m. The height of the gate 150 may be varied at arbitrary intervals (for example, at intervals of 50 cm). By narrowing the interval, the height of the gate can be changed in detail.

FIG. 13 is a diagram showing an example of the water gate condition monitoring screen GM1. The processor 31 generates a water gate status monitoring screen GM1 based on the image captured by the monitoring camera 10 and displays it on the display unit 33 . A video display area 351, a water level display area 352, a water gate height display area 353, an open/close determination icon 355, an open gate instruction icon 356, a close gate instruction icon 357, and a message display area 358 are arranged on the water gate status monitoring screen GM1.

In the video display area 351, in addition to the captured video of the monitoring camera 10, the reproduced video recorded in the recording unit 35 or the recorder 40 is displayed. The water level display area 352 displays the water level of the river. The water gate height display area 353 displays the height of the gate 150 . The open/close determination icon 355 accepts an operation for determining whether the gate 150 is open or closed when the icon 355 is pressed. Gate-open instruction icon 356 accepts an operation to open gate 150 by being pressed. Gate closing instruction icon 357 accepts an operation to close gate 150 when pressed. In the message display area 358, an instruction message issued by the processor 31 to the observer is displayed.

As described above, in the water gate monitoring system 5 according to the first embodiment, the monitoring camera 10 (an example of a camera) that captures an image of the vicinity of the water gate 100 and the PC 30 (an example of a water gate monitoring device) are communicably connected. The monitoring camera 10 captures an image including the water level gauge 93 indicating the water level in the vicinity of the water gate 100 and the water gate 100 as subjects, and repeatedly transmits the captured image to the PC 30 . The PC 30 is communicably connected to a water gate opening/closing device 70 that controls opening and closing of the water gate 100 . The PC 30 determines the water level based on the captured image, and transmits an opening/closing control signal for the water gate 100 according to the determined water level to the water gate opening/closing device 70 . The PC 30 determines the opening/closing status of the water gate 100 after the opening/closing control based on the captured image.

As a result, the water gate monitoring system 5 adaptively determines the water level of the river and whether or not the water gate should be opened or closed by using the image captured by the monitoring camera 10 whose angle of view is set so as to include the river near the water gate. can be discriminated. Therefore, for example, a supervisor who monitors the situation of the water gate 100 in the building 120 or remotely can easily grasp the water level and whether or not the water gate needs to be opened or closed from the image captured by the single monitoring camera 10, which is efficient. Can assist in performing lock monitoring.

The floodgate monitoring system 5 also includes a recorder 40 (an example of a recording unit) connected to the PC 30 . The PC 30 saves in the recorder 40 the determination result of the opening/closing status of the water gate 100 after the opening/closing control. This allows the watchman to know the history of the opening and closing of the water gate. Therefore, it can be used for the opening and closing operation of the water gate.

In addition, in the floodgate monitoring system 5, the PC 30 displays on the display unit 33 the floodgate status monitoring screen GM1 (an example of the monitoring status screen) including the determined water level, the determined open/close status of the floodgate 100, and the captured image. do. As a result, the monitor can visually grasp the water level, the image of the water gate, and the opening/closing state of the water gate on the same screen. Observers are expected to respond quickly to sudden rises and falls in water levels.

In addition, the PC 30 further includes an instruction message for instructing opening/closing of the water gate, an opening instruction icon 356 for instructing an operation for opening the water gate, and a closing instruction icon 357 for instructing an operation for closing the water gate. displayed. As a result, the guard can confirm the instruction message and perform the operation of opening or closing the gate on the same screen. The observer can check the situation and give instructions without moving from the place where the screen is displayed. It is expected that the watcher will be able to quickly respond, and the convenience will be improved.

In addition, in the water gate monitoring system 5, a plurality of water level two-dimensional codes 81 having height information are provided at intervals of 1 m (an example of predetermined intervals) along the scale of the water gauge 93 within the angle of view of the monitoring camera 10. (an example of a plurality of information codes) is provided. The PC 30 determines the water level on the basis of the lowest height information of the notation plate of the water level two-dimensional code 81 included in the captured image. As a result, it is possible to automatically and accurately determine the water level using the captured image.

The water gate 100 also has a gate 150 attached to a pair of gateposts 110 so as to be vertically movable, and is opened and closed by the water gate opening/closing device 70 according to the height of the gate 150 . Above the gate 150 (predetermined position), at least one notation plate (an example of the second information code) of the height two-dimensional code 85 for determining the height of the gate 150 is arranged. The PC 30 determines the open/close state of the water gate based on the height of the notation plate of the height two-dimensional code 85 included in the captured image. As a result, it is possible to automatically and accurately determine the open/close state of the water gate using the captured image.

The monitoring camera 10 includes an IR irradiation section 19 (an example of a light irradiation section) that irradiates light toward a subject including the water gauge 93 and the water gate 100 . The monitoring camera 10 acquires a captured image while being irradiated with light by the IR irradiation unit 19 . As a result, it is possible to determine the water level and the opening/closing status of the water gate from the captured image even at night. Therefore, it is possible to reduce the work load of the observer.

(Embodiment 2)
In the first embodiment, the water level is measured using the two-dimensional code for water level, and the two-dimensional code for height is used to open and close the gate so that the height of the gate corresponds to the water level. Indicated. In the second embodiment, in addition to the opening/closing operation of the gate according to the first embodiment, a separate opening/closing two-dimensional code plate is attached to the gate, and the opening/closing determination of the floodgate is performed using this opening/closing two-dimensional code. indicates

The floodgate monitoring system according to Embodiment 2 has substantially the same configuration as that of Embodiment 1 except for the two-dimensional code for opening and closing the display plate. The same reference numerals are used for the same components as in the first embodiment, and the description thereof is omitted.

FIG. 14 is a diagram showing an example of a captured image in which the gate 150 is open within the angle of view of the surveillance camera 10 according to the second embodiment. On the front of the gate 150, two-dimensional open/close code 88L, 88R notation plates (hereinafter simply referred to as the open/close two-dimensional code 88L, 88R) are affixed at two locations on the left and right. When the left and right opening/closing two-dimensional codes 88L and 88R are not particularly distinguished, they are simply referred to as an opening/closing two-dimensional code 88. FIG. The two opening/closing two-dimensional codes 88L and 88R each include two-dimensional code identification information, construction date, water gate identification number, and position information (eg, latitude, longitude, altitude, etc.). It is preferable that the two open/close two-dimensional codes 88L and 88R do not store the same contents, but store different contents (for example, identification numbers and position information).

The surveillance camera 10 performs pan/tilt/zoom operations to change its attitude, and the left and right opening/closing two-dimensional codes 88L and 88R attached to the front of the gate 150 fit within the angle of view. An imaging area different from 1 is imaged. It should be noted that if the surveillance camera cannot image the opening/closing two-dimensional code from the front, the surveillance camera may perform projective transformation to obtain a square transformed image and decode the two-dimensional code, as described in the above embodiment. Same as 1.

In FIG. 14, the gate 150 is open. When the gate 150 is open, both the left and right opening/closing two-dimensional codes 88L and 88R are positioned upward in the image captured by the monitoring camera 10. FIG. The memory 32 of the PC 30 holds a threshold value Ht for judging whether the water gate is open or closed. Within the angle of view, this threshold Ht is assumed to be a horizontal line (indicated by a dashed line in the figure) having a given height.

Processor 31 of PC 30 compares the height of opening/closing two-dimensional code 88 with threshold value Ht. The processor 31 determines that the water gate is open when the height of the two-dimensional code 88 for opening and closing exceeds the threshold value Ht, and determines that the water gate is closed when the height of the two-dimensional code 88 for opening and closing is less than the threshold value Ht. judge. As an example, in FIG. 14, the threshold is 2m. In this case, when the height of the opening/closing two-dimensional code 88 exceeds 2 m, the processor 31 determines that the gate is open.

FIG. 15 is a diagram showing an example of a captured image in a state where the gate 150 is closed within the angle of view of the surveillance camera 10. As shown in FIG. If the height of the opening/closing two-dimensional code is less than the threshold value of 2 m, the processor 31 determines that the gate is closed.

FIG. 16 is a flowchart showing the opening/closing operation of the water gate 100 and the opening/closing determination procedure when the water level rises according to the second embodiment. The same step processing as in FIG. 7 according to the first embodiment is denoted by the same reference numeral, and the description thereof is omitted. The processor 31 of the PC 30 determines whether or not the monitor has selected the open/close determination icon 355 on the water gate status monitoring screen GM1 displayed on the display unit 33 (S1A). If the open/close determination icon 355 is not selected, the processor 31 performs the same processing as in the first embodiment. That is, the processor 31 outputs an instruction to adjust the height of the gate 150 according to the water level to the water gate operator 70 via the communication I/F 37 and the hub 50 .

On the other hand, when the open/close determination icon 355 is selected, the processor 31 performs open/close determination of the water gate 100 (S4). In determining whether the water gate 100 is open or closed, the processor 31 first changes the parameters (pan angle, tilt angle, zoom magnification) of the surveillance camera 10 to predetermined preset values. Processor 31 transmits the changed parameter information to surveillance camera 10 via communication I/F 37 and hub 50 . As a result, the surveillance camera 10 changes its posture so that the left and right opening/closing two-dimensional codes 88L and 88R attached to the gate 150 are accommodated within the angle of view.

The monitoring camera 10 takes an image and transmits the image including the opening/closing two-dimensional code 88 to the PC 30 . The processor 31 of the PC 30 performs opening/closing determination by comparing the height of the opening/closing two-dimensional code 88 included in the received image with the threshold value Ht.

An example of determination conditions is as follows. "Open" means that the opening/closing two-dimensional code is equal to or greater than the threshold value. "Closed" indicates that the opening/closing two-dimensional code is less than the threshold. When both of the two open/close two-dimensional codes 88L and 88R indicate "open", the processor 31 determines that the water gate is open. When both of the two open/close two-dimensional codes 88L and 88R indicate "closed", the processor 31 determines that the water gate is closed. If one of the two opening/closing two-dimensional codes 88L and 88R is "open" and the other is "closed," the processor 31 does not make a decision. If neither of the two opening/closing two-dimensional codes 88L, 88R are readable, the processor 31 makes no determination. If one of the two open/close two-dimensional codes 88L and 88R is "open" and the other is unreadable, the processor 31 determines that the water gate is open. If one of the two opening/closing two-dimensional codes 88L and 88R is "closed" and the other is unreadable, the processor 31 determines that the water gate is closed.

The processor 31 repeatedly performs this opening/closing determination at intervals of several seconds. The processor 31 records the open/close determination result in the recording unit 35 . In addition, the processor 31 displays on the display unit 33 the water gate condition monitoring screen GM2 (see FIG. 17) including the determination result. After the open/close determination is completed, the processor 31 resets the parameters (pan angle, tilt angle, zoom magnification) of the surveillance camera 10 to initial values. The angle of view of the monitoring camera 10, which is set to the initial value, includes a plurality of water level two-dimensional codes 81 attached adjacent to the water gauge 93 and a height two-dimensional code attached to the top of the gate 150. 85 fits. Processor 31 transmits initial values of parameters to surveillance camera 10 via communication I/F 37 and hub 50 . The monitoring camera 10 returns to its initial posture. After that, the processor 31 terminates this process. The open/close determination process shown in FIG. 16 can be similarly applied to the process shown in FIG. 10 when the water level is lowered.

FIG. 17 is a diagram showing an example of the water gate condition monitoring screen GM2 when open/close determination is performed. This water gate status monitoring screen GM2 is displayed when the open/close determination icon 355 is selected on the water gate status monitoring screen GM1. Further, after the opening/closing determination is performed, the water gate status monitoring screen GM2 is updated so as to include the result of the opening/closing determination. The water gate status monitoring screen GM2 includes a video display area 451, a height area 452 of the two-dimensional code 88L for opening/closing on the left side, a height area 453 of the two-dimensional code 88R for opening/closing on the right side, an opening/closing determination result area 454, and a reading result area. 455 included.

An image captured by the monitoring camera 10 is displayed in the image display area 451 . The captured image includes the gate 150 and two opening/closing two-dimensional codes 88L and 88R attached to the gate 150 . As described above, it is preferable that the two opening/closing two-dimensional codes 88L and 88R do not store the same contents, but store different contents (for example, identification numbers and position information). An illustration simulating the captured image may be drawn instead of the captured image.

In the height area 452 of the left opening/closing two-dimensional code 88L and the height area 453 of the right opening/closing two-dimensional code 88R, the height of the left opening/closing two-dimensional code 88L and the right opening/closing 2D code 88L are respectively displayed. The height of the dimension code 88R is displayed. The result of open/close determination is displayed in the open/close determination result area 454 . Reading result area 455 displays reading OK or reading impossible as the reading result.

As described above, in the water gate monitoring system 5 according to the second embodiment, the PC 30 displays the threshold value Ht for determining that the water gate 100 is open, and the two-dimensional code 88 for opening and closing included in the captured image. Compare the height of As a result of the comparison, when the height of the plate indicating the opening/closing two-dimensional code 88 is equal to or higher than the threshold value Ht, the PC 30 determines that the water gate is open. As a result of the comparison, if the height of the plate on which the open/close two-dimensional code 88 is written is less than the threshold value, the PC 30 determines that the water gate is closed. Thereby, the water gate monitoring system 5 can easily determine whether the water gate is open or closed. Also, the lifeguards can know instantly whether the floodgates are open or closed.

In addition, a plurality of opening/closing two-dimensional code 88 inscription plates are arranged at the same height on the gate 150 . When the height of at least one of the plates representing the opening/closing two-dimensional code 88 is equal to or higher than the threshold value Ht, the PC 30 determines that the water gate is open. As a result, even if the surface of at least one of the plurality of two-dimensional codes for opening and closing becomes unreadable due to mud adhering to the surface of the two-dimensional code for opening and closing, the readability of the two-dimensional code for opening and closing can be increased. can be used to determine the open state of the floodgate. Therefore, it is possible to avoid a situation in which the open state of the water gate cannot be determined.

If the height of at least one of the plates representing the opening/closing two-dimensional code 88 is less than the threshold value Ht, the PC 30 determines that the water gate is closed. As a result, even if the surface of at least one of the plurality of two-dimensional codes for opening and closing becomes unreadable due to mud adhering to the surface of the two-dimensional code for opening and closing, the readability of the two-dimensional code for opening and closing can be increased. can be used to determine the closed state of the floodgate. Therefore, it is possible to avoid a situation in which the closed state of the water gate cannot be determined.

In addition, although the case where the two-dimensional code for opening and closing is two in the second embodiment described above, the number may be three or more. In the second embodiment described above, when at least one opening/closing two-dimensional code is determined to be "open", it is determined that the water gate is open. Also, in the case of three or more, if the number of opening/closing two-dimensional codes that are determined to be "open" is greater than the number of two-dimensional codes that are not determined to be open, the PC determines that the floodgate is open. good. Further, when at least one opening/closing two-dimensional code among a plurality of opening/closing two-dimensional codes is determined to be "closed", it may be determined that the water gate is closed. In the case of three or more, if the number of two-dimensional codes for opening and closing determined to be "closed" is greater than the number of two-dimensional codes not determined to be "open", the PC determines that the gate is closed. good.

(Modification of Embodiment 2)
In the water gate monitoring system according to the second embodiment described above, the opening/closing of the water gate is determined using the left and right two-dimensional codes 88 for opening and closing respectively attached to the front of the gate 150. The two-dimensional code 85 for height may be used to determine whether the water gate is open or closed. If the pair of left and right two-dimensional codes 88 for opening and closing become unusable due to dirt or damage, the two-dimensional code 85 for height can be used as a backup to determine opening and closing. Therefore, it is possible to avoid a situation in which open/close determination cannot be made.

Further, in the water gate monitoring system according to the second embodiment described above, a function for judging opening/closing is added to the function for automatically adjusting the height of the gate according to the water level according to the first embodiment. However, the water gate monitoring system 5 may have only the function of open/close determination. In this case, the water level two-dimensional code 81 for measuring the water level and the height two-dimensional code 85 for obtaining the height of the gate can be eliminated. Furthermore, the monitoring camera can be changed from a camera having a PTZ function to a fixed camera capable of imaging only the front of the gate. Moreover, the processing load of the water gate monitoring system executed by the PC 30 can be reduced, and the software can be simplified. Therefore, it is possible to construct a simple floodgate monitoring system suitable for the scale of the floodgate.

Various embodiments have been described above with reference to the drawings, but it goes without saying that the present disclosure is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications, modifications, substitutions, additions, deletions, and equivalents within the scope of the claims. Naturally, it is understood that it belongs to the technical scope of the present disclosure. In addition, the constituent elements of the various embodiments described above may be combined arbitrarily without departing from the gist of the invention.

In addition, the present disclosure also applies to a program that implements the functions of the floodgate monitoring device (PC 30) of the above-described embodiment, supplied to the device via a network or various storage media, and read and executed by the computer in this device. Range.

The present disclosure adaptively determines the state of the water level of the river and the necessity of opening and closing the water gate using the captured image of the camera set so that the river near the water gate is included in the angle of view, and efficiently It is useful as a floodgate monitoring system, a floodgate monitoring method, and a program for supporting execution of floodgate monitoring.

5 Flood gate monitoring system 10 Surveillance camera 30 PC
70 Water gate operator 81 Two-dimensional code for water level 85 Two-dimensional code for height 88 Two-dimensional code for opening and closing 100 Water gate 150 Gate

Claims (11)

A water gate monitoring system in which a camera for imaging the vicinity of a water gate having a gate and a water gate monitoring device are communicably connected,
The camera is
capturing a captured image including a water gauge indicating a water level in the vicinity of the water gate and the water gate as subjects, and repeatedly transmitting the captured image to the water gate monitoring device;
The water gate monitoring device
The water gate opening/closing device is communicably connected to control opening/closing of the water gate, determines the water level based on the captured image , and outputs a water gate opening/closing control signal corresponding to the determined water level. send to the device,
Determining the opening/closing status of the water gate based on the position in the captured image of at least one information code arranged on the gate included in the captured image;
Gate monitoring system. further comprising a recording unit,
The water gate monitoring device saves the determination result of the opening/closing status of the water gate after the opening/closing control in the recording unit.
The floodgate monitoring system of claim 1. The water gate monitoring device displays a monitoring status screen including the determined water level, the determined open/close status of the water gate, and the captured image on a display unit.
The floodgate monitoring system of claim 1. The water gate monitoring device further includes, on the monitoring status screen, a message for instructing opening and closing of the water gate, a gate opening instruction icon for instructing an operation to open the water gate, and a gate closing instruction icon for instructing an operation for closing the water gate. to display
A floodgate monitoring system according to claim 3. A plurality of second information codes having height information are arranged at predetermined intervals along the scale of the water gauge within the angle of view of the camera,
The water gate monitoring device determines the water level based on whether or not each of the plurality of second information codes included in the captured image is recognizable.
The floodgate monitoring system of claim 1. The water gate monitoring device determines the opening/closing status of the water gate based on the vertical height of the information code in the captured image as the position of at least one information code arranged on the gate included in the captured image. do
The floodgate monitoring system of claim 1. The water gate monitoring device determines that the height corresponding to the position of the information code is based on a threshold for determining that the water gate is open and the position of the information code included in the captured image . If it is equal to or greater than the threshold value, it is determined that the water gate is open, and if it is less than the threshold value, it is determined that the water gate is closed;
The floodgate monitoring system of claim 1 . The plurality of information codes are arranged at the same height of the gate,
The water gate monitoring device determines that the water gate is open when the height of at least one of the plurality of information codes is equal to or greater than the threshold value.
A floodgate monitoring system according to claim 7. The plurality of information codes are arranged at the same height of the gate,
The water gate monitoring device determines that the water gate is closed when the height of at least one of the plurality of information codes is less than the threshold value.
A floodgate monitoring system according to claim 7 or 8 . A water gate monitoring method in a water gate monitoring system in which a camera for imaging the vicinity of a water gate having a gate and a water gate monitoring device are communicably connected,
The camera is
capturing a captured image including a water gauge indicating a water level in the vicinity of the water gate and the water gate as subjects, and repeatedly transmitting the captured image to the water gate monitoring device;
The water gate monitoring device
The water gate opening/closing device is communicably connected to control opening/closing of the water gate, determines the water level based on the captured image , and outputs a water gate opening/closing control signal corresponding to the determined water level to the water gate opening/closing device. send to the device,
Determining the opening/closing status of the water gate based on the position in the captured image of at least one information code arranged on the gate included in the captured image;
Flood monitoring method. A floodgate monitoring device, which is a computer, is communicatively connected to a camera that captures images of the vicinity of a floodgate having a gate,
Determination of the water level based on captured images including a water gauge indicating the water level in the vicinity of the water gate and the water gate repeatedly transmitted from the camera, and determining the water level of the water gate according to the determined water level. sending an opening/closing control signal to a water gate opening/closing device that controls opening/closing of the water gate;
determining the opening/closing status of the water gate based on the position in the captured image of at least one information code arranged on the gate included in the captured image;
program.

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